题目
A.?SUB STR(XY, 15,4)+SUBSTR(XY, 1,0)+SUBSTR(XY, 10)
B.?SUBSTR(XY, 15,4)+LEFT(XY, 1,10)+RIGHT(XY, 19)
C.?SUBSTR(XY, 15,4)+LEFTCXY, 10)-1- RIGHT(XY, 10)
D.?SUBSTR(XY, 15,4)+LEFT(XY, 10)+RIGHT(XY, 19,10)
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